Questions and Answers on Ishavasya Upanishad Mantras 1- 18. This lecture was given by Swami Tattwamayananda on April 6, 2012. -Story of King Parikshit from the Bhagavata Purana -Story of Nachiketa asking for three boons (from Kathopanishad)-Shankaracharya's two definitions of the word 'Purusha' -Importance of Shankara's commentaries for understanding the philosophy of Upanishads - विवर्तवाद (Vivarta-vada) & परिणामवाद (Parinama-vada)